You have not given the free body diagram which is very necessary to understand

Anyway, I amgiving the diagram. We assume the length of the spine is L

Taking the torques about A

\(\displaystyle?={350}\cdot{\frac{{{L}}}{{{2}}}}+{200}\cdot{L}-{T}{\sin{{12}}}\cdot{\left({\frac{{{2}}}{{{3}}}}\right)}{L}={0}\)

solve for T

b) Taking the forces about the x direction.

\(\displaystyle{F}_{{x}}={R}_{{x}}-{T}{\cos{{12}}}={0}\)

Substitutingfor T solve for \(\displaystyle{R}_{{x}}\)